Blue-red azo dye.



EN ilZED Slfiifll earnnr tor ion Tii'l'fl lfttil NE, GERM AN Y. ASSIGNOR tlif', OF LU DWIGSHAFEN ON -THE- Rl-HNE, GZERMAQEZ; A @GRFORKZIt No. 833,605. tiptniilcrtion.

'..etters Patent. Patented Get. 16, 1906.

To all whom, may concern.-

Be it known hat l, Parr, Jean's doctor of philosophy and chemist, a subject of the Emperor of Aus sis-Hungary, residing at Ludwigshafen-on toe-Rhine, Kingdom of Save-- ria, German ilrnpire, have invented new and useful Imprr cements in A210 Coloring-Matters, of which the following is a specification. My invention relates to the manufacture of azo coloring-matters b *combining the mono alkyl ethers of 1.4 dihydroxynaphthalere: with sulfona'ted diazo and tetrezo compounds of'the benzene and naphthalene series, the coloring-matters so produced yielding from red to violet shades which are fast against the action of light; As a rule, the coloring-matters obtained by employing the ethyl ether of 1.4-dihydroxynaphthalene yields shades which are bluer than those obtained from the corresponding methyl ether and those ob tained from monoalkyl eth'ers-for instance, the monoaniyl ether-in which the alkyl group is still largeigproduce shades which are still bluer than those yielded by the coloringmatters obtained from the monoethyl ether. My new coloring-matters are further charac terized by being soluble in water, giving from red to violet solutions. l pon reduction with tin and hydrochloric acid they yield a monoalkyl ether of ainido-dihydroxynaphthalene. ihe coloring-matter which 1 wish to claim specifically is that obtained by combining diazotized metanilic acid with the monoethyl ether of1.4 dihydroxynaphthalene. it yields a bluish-red solution in water and also dyes wool, giving'bluish-red shades. I

For the sake of convenience I give two examples showing how the monoalltyl ethers oi i.et-dilnydroxynaphthalene can be obtained on a commercial scale narnely, by treating 1. l-dihydroxynaphthalene with alcohol and mineral acid. I make no claim, however, to the production of these ethers, some of which l have been prepared previously by Russig. 1 (See Journulfiir pick. 'Chemie, N. F., 62, 50.) l In carrying; out the process the etheriiication must not be allowed to proceed too far, but should -be stopped as soon as thereis no or no dihydroxynaphthalene unact ed upon. The parts are by weight. l Example ].--Pr0d'u-ctio n of the monomefltyl ether of 1.4-dihydrom'ynaphthaZene.-Dissolve fifty parts of 1.-dihydroXynaphthalene 1 practically in two hundred and. fifty (250) parts of a cold solution of hydrochloric acid in methyl alcohol (containing eighteen (18) grams .HCl in one hundred (160) cubic centin1eters,)allow the mixture to stand at ordinary temperature for about fifteen (15) hours, precipitate with water, and rccrystallize from benzene or ligroin the monomethyl ether which can thus be obtained in the forniof colorless needles, melting at a temperature of one hundred and thirty-one (131 degrees centigrade.

Example 2.Pr0ducti0n 0f the monoethyl ether of 1.4-clihydroxynaphthaZene.-Boil to-- gether in a reflux apparatus for about thirty (30) minutes one hundred (100) parts of Ltdihydroxynaphthalene and three hundred (300) part soi an ethyl alcoholic hydrochloricacid solution (containing three (3) grams of HCl in one hundred (100) cubic centimeters) and work up the reaction product in the manner described in the foregoing Example 1. The n'ionoethyl other is obtained in colorless needles, which melt at a temperature of about one hundred and five (105) degrees centigrade.

In a similar manner other corresponding ethers can be obtained-for instance, the numoisoamyl other. which consists of colorless needles and melts at a temperature of ninety-eight (9.8 degrees centigrade.

The following example will serve to further illustrate the nature of my intention and a method ot carrying it into practical ellect; but my invention is not confined to this example. The parts are by weight. Diazotize seventeen and three-tenths (17.3) parts oi n1 e'tanilic acid and allow the diazo solution to run into a solution of seventeen and two-fifths (1.7.4) parts of the sodium salt of the monomethyl ether of 1.-tdihydroxynaphthalene to which sufficient sodium carbonate has been added to'maintsin the whole alkaline, at the same time stirring well and keeping the temperature at about zero (0) centigrade. The combination is complete after a short time and the greater pert of the coloring-matter separates out in the form of leallcts with a metallic luster, the remainder being precipitated by the addition of connnon salt to the solution. It dissolves in water, yielding a bluish-red solution and dyes wool very level bluish-red shtuies.- t

The following table gives some of the espe- LOO ana ly-valuable coloring-limiters obtainable ace Ztliill to in ention:

3i'oi .0methy l or nionoethyl-ether of IA-dihydroiziynapnthalene combined with diazow:

Shade.

is bluis red yellow-red.

L cherry-red.

1 0C violet-red. Lncebpphenglenadimni claret-red.

ehromwl green. o-azobenzene-disulfo-aciti claret-red. .aphthylamin-sulfo-acid re(l-violet. red-\'io1et. reddish violet. disulfo-aci violet-red. z i sulfa-acid DOHCQQUTELL 28 aniarautln 53.6.8 disulfo-ncid amaranth.

on wool red v50 i ..i .i. let,

i on cotton violet. on wool violet b 1 v I. 1, .iudosonbene disultO duo on cotton blue x.54mphthalene-diamni-2sulfoacid Ni 01: wool violet.

Benzidindisulfo-acid New what I claim is- 1. As new articles of manufacture the azo colornrq-nmtters which can he obtained by combining a inonoalkyl ether of 1.4-dihydroxynaphthslene with a l1erei11l efore-defined diazotized sroinatie ainin sulfo-acid which coloring-matters are soluble in water yielding from red to violet solutions which dye WOOi yielding from red to violet shades and which upon reduction with tin and hydrochloric acid yield a. monoalkyl ether of aniido-dihydroxynaphthalene.

upon reduction with tin and hydrochloric acid yields a inonoet-hyl ether of an1ido-dihydroxyi'iaphthzilene.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses. I PAUL JULIUS.

Witnesses:

ERNEST F. EHRHARDT, J. ALEC. LLOYD. 

